drm/ast: Use managed MM initialization

Cleaning up ast's MM code with ast_mm_fini() resets the write-combine
flags on the VRAM I/O memory. Drop ast_mm_fini() in favor of an auto-
release callback. Releasing the device also executes the callback.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716125353.31512-7-tzimmermann@suse.de

3 files changed, 12 insertions, 13 deletions

diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 9a770e5b36d1..e3a264ac7ee2 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -291,7 +291,6 @@ int ast_mode_config_init(struct ast_private *ast);
 #define AST_MM_ALIGN_MASK ((1 << AST_MM_ALIGN_SHIFT) - 1)
 
 int ast_mm_init(struct ast_private *ast);
-void ast_mm_fini(struct ast_private *ast);
 
 /* ast post */
 void ast_enable_vga(struct drm_device *dev);
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 87e5baded2a7..dd12b55d57a2 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -452,6 +452,5 @@ void ast_driver_unload(struct drm_device *dev)
 	ast_release_firmware(dev);
 	kfree(ast->dp501_fw_addr);
 
-	ast_mm_fini(ast);
 	kfree(ast);
 }
diff --git a/drivers/gpu/drm/ast/ast_mm.c b/drivers/gpu/drm/ast/ast_mm.c
index aaeb19d01052..9186ec3ebbe0 100644
--- a/drivers/gpu/drm/ast/ast_mm.c
+++ b/drivers/gpu/drm/ast/ast_mm.c
@@ -28,8 +28,9 @@
 
 #include <linux/pci.h>
 
-#include <drm/drm_print.h>
 #include <drm/drm_gem_vram_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_print.h>
 
 #include "ast_drv.h"
 
@@ -73,6 +74,15 @@ static u32 ast_get_vram_size(struct ast_private *ast)
 	return vram_size;
 }
 
+static void ast_mm_release(struct drm_device *dev, void *ptr)
+{
+	struct ast_private *ast = to_ast_private(dev);
+
+	arch_phys_wc_del(ast->fb_mtrr);
+	arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),
+				pci_resource_len(dev->pdev, 0));
+}
+
 int ast_mm_init(struct ast_private *ast)
 {
 	u32 vram_size;
@@ -93,14 +103,5 @@ int ast_mm_init(struct ast_private *ast)
 	ast->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
 					pci_resource_len(dev->pdev, 0));
 
-	return 0;
-}
-
-void ast_mm_fini(struct ast_private *ast)
-{
-	struct drm_device *dev = ast->dev;
-
-	arch_phys_wc_del(ast->fb_mtrr);
-	arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),
-				pci_resource_len(dev->pdev, 0));
+	return drmm_add_action_or_reset(dev, ast_mm_release, NULL);
 }